Effect of nitrogen on phosphorus recovery by winter wheat | Slāpekļa mēslojuma ietekme uz fosfora izmantošanos ziemas kviešiem
2015
Lipenite, I., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Karklins, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Soil and Plant Sciences | Ruza, A., Latvia Univ. of Agriculture, Jelgava (Latvia). Faculty of Agriculture. Inst. of Agrobiotechnology
Phosphorous turnover in agricultural soils has high agronomic and environmental importance. Therefore relevant studies were performed during 2009–2012. Field experiments with winter wheat varieties ‘Bussard’ un ‘Zentos’ were carried out in two places in Latvia. In each trial treatments were compared starting from unfertilized, fertilized with PK, as well as PK with increasing nitrogen input: 30, 60, 90, 120, 150, 180 and 210 kg haE-1 N (ammonium nitrate). In experimental farm „Peterlauki” experiments were carried out on Endoprotocalcic Chromic Stagnic Luvisol (Clayic, Cutanic, Hypereutric), silty clay loam/clay; organic matter (OM) 20–31 g kgE-1, pH KCl 6.6–7.0 and medium phosphorous and potassium content easily utilized by plants. In Stende experiments were carried out on Eutric Stagnic Retisol (Cutanic, Drainic, Loamic), sandy clay loam; OM 21–23 g kgE-1, pH KCl 5.8–6.7, and high to very high phosphorous and medium potassium content. PK application rates for all plots (except no fertilisation) included 30 kg haE-1 P2O5 and 90 kg haE-1 K2O. Phosphorous utilisation from soil resources and fertilisers applied were studied and are discussed in this paper. Higher soil phosphorous uptake by winter wheat as well as its relatively high apparent recovery was obtained in Peterlauki. Application of PK fertilizers without nitrogen showed small effect on phosphorous uptake by wheat. A significant increase of phosphorus uptake in Stende was observed by increasing nitrogen rates up to 120 kg haE-1 N. As regards “Peterlauki”, only applications of 30 and 60 kg haE-1 N showed a significant increase of phosphorous uptake.
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